US8335828B2 - Access by data communication of an E-mail addressed to storage device - Google Patents

Access by data communication of an E-mail addressed to storage device Download PDF

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US8335828B2
US8335828B2 US12/506,244 US50624409A US8335828B2 US 8335828 B2 US8335828 B2 US 8335828B2 US 50624409 A US50624409 A US 50624409A US 8335828 B2 US8335828 B2 US 8335828B2
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mail
storage medium
terminal
access
storage device
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US20090276501A1 (en
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Shinsuke Saito
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Buffalo Inc
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Buffalo Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/18—File system types
    • G06F16/182—Distributed file systems
    • G06F16/1824—Distributed file systems implemented using Network-attached Storage [NAS] architecture
    • G06F16/1827—Management specifically adapted to NAS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
    • H04L51/07—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail characterised by the inclusion of specific contents
    • H04L51/08—Annexed information, e.g. attachments

Definitions

  • the present invention relates to a storage device connected through an internal network to an external network, a storage system having the storage device, and the control thereof.
  • a protocol such as a Server Message Block (SMB) protocol is used to share files of Network Attached Storage (NAS) connected to a Local Area Network (LAN).
  • SMB Server Message Block
  • LAN Local Area Network
  • FTP File Transfer Protocol
  • Japanese Patent Application Laid-open No. 2005-301809 describes uploading of data files from a data transfer device to an FTP server, and downloading of data files from the FTP server to a different data transfer device.
  • the present invention discloses to provide a storage medium of a storage device to be accessed from an external terminal without having to specially set a network exchange or firewall.
  • One aspect of the present invention provides a storage device, comprising:
  • Another aspect of the present invention provides a storage system, comprising:
  • Accessing the storage medium from the terminal includes reading out files from the storage medium, writing files to the storage medium, reading out the configuration of folders (also referred to as directories) from the storage medium, deleting files and folders from the storage medium and the like.
  • Data communication of e-mails carried out by the storage device with the terminal includes both sending of e-mails to the terminal and receiving of e-mails from the terminal.
  • data communication of e-mails carried out by the terminals with the storage device includes both sending of e-mails to the storage device and receiving of e-mails from the storage device.
  • the present invention can also be applied to, for example, a control method having steps corresponding to the configuration of the device and system described above, a program for causing a computer to realize functions corresponding to the configuration of the device and system described above, a computer-readable recording medium on which the program is recorded, and a program product using the program.
  • FIG. 1 is an exemplary illustration of a block diagram schematically showing the configuration of a storage system.
  • FIG. 2 is an exemplary illustration of a block diagram schematically showing the hardware configuration of a storage system.
  • FIG. 3 is an exemplary illustration of a block diagram showing the hardware configuration of a personal computer.
  • FIG. 4 is an exemplary illustration of a block diagram showing the hardware configuration of a cell phone.
  • FIG. 5 is an exemplary illustration of a block diagram showing the hardware configuration of a mail server.
  • FIG. 6 is an exemplary illustration of a block diagram schematically showing the configuration of folders formed in a storage medium.
  • FIG. 7 is an exemplary illustration of a flow chart showing setting processing carried out by an internal personal computer.
  • FIG. 8 is an exemplary illustration of a flow chart showing mail reception processing carried out by an external personal computer.
  • FIG. 9 is an exemplary illustration of a flow chart showing mail reception processing carried out by a storage device.
  • FIG. 10 is an exemplary illustration of a flow chart showing folder structure readout processing carried out by a storage device.
  • FIG. 11 is an exemplary illustration of a flow chart showing file readout processing carried out by a storage device.
  • FIG. 12 is an exemplary illustration of a flow chart showing file storage processing carried out by a storage device.
  • FIG. 13 is an exemplary illustration of a flow chart showing deletion processing carried out by a storage device.
  • FIG. 14 is an exemplary illustration of a flow chart showing all deletion processing carried out by a storage device.
  • FIG. 15 is an exemplary illustration of a drawing showing a display of an e-mail in the case of requesting commencement of access.
  • FIG. 16 is an exemplary illustration of a drawing showing a display of a reply mail in the case of having requested commencement of access.
  • FIG. 17 is an exemplary illustration of a drawing showing a display of an e-mail in the case of searching for a file and the like to be accessed.
  • FIG. 18 is an exemplary illustration of a drawing showing a display of a reply mail in the case of having searched for a file and the like to be accessed.
  • FIG. 19 is an exemplary illustration of a drawing showing a display of an e-mail in the case of reading out a file.
  • FIG. 20 is an exemplary illustration of a drawing showing a display of a reply mail in the case of having read out a file.
  • FIG. 21 is an exemplary illustration of a drawing showing a display of an e-mail in the case of storing a file.
  • FIG. 22 is an exemplary illustration of a drawing showing a display of a reply mail in the case of having stored a file.
  • FIG. 25 is an exemplary illustration of a drawing showing a display of an e-mail in the case of deleting all files and the like.
  • programs and other executable program components are illustrated herein as discrete blocks, although it is recognized that such programs and components may reside at various times in different storage components, and are executed by the data processor(s) of the computers.
  • a typical example of the external network 11 is the Internet.
  • the external network 11 may be a WAN and the like provided it is a different network from the internal network.
  • NAS 200 may be connected to the internal network, or a personal computer (PC) 400 , Personal Digital Assistant (PDA) 500 , cell phone, game machine or other type of terminal may also be connected.
  • PC personal computer
  • PDA Personal Digital Assistant
  • a plurality of devices can be connected to a router 110 through a line concentrator such as a hub. Only one or a plurality of NAS may be provided.
  • the internal network 12 is connected to the external network 11 through the router 110 , a firewall 120 and a modem 130 .
  • the router 110 is a relay device for converting the protocol between data flowing within an LAN 12 and data flowing within the external network 11 .
  • the router 110 is provided with, for example, an LAN adapter circuit physically connected to the LAN 12 , a circuit for realizing transmission and reception of data between the LAN adapter circuit and the modem, a Central Processing Unit (CPU) for controlling processing such as imparting an Internet Protocol (IP) address to the NAS 200 and the like, Read Only Memory (ROM), Random Access Memory (RAM), and a timer circuit.
  • IP Internet Protocol
  • ROM Read Only Memory
  • RAM Random Access Memory
  • the firewall 120 is a system for preventing unauthorized access to the LAN 12 from the outside such as from the external network 11 . More specifically, the firewall 120 monitors data flowing through the boundary with the outside, detects any unauthorized accesses and blocks those accesses so as to prevent eavesdropping, tampering and destruction of data and programs through an external network.
  • the firewall function may be realized in the form of dedicated hardware as shown in the drawings, or it may be realized by installing a program for realizing a firewall function in a computer. For example, in the case of large corporations, an information management system having a firewall function is installed between a router and an external network. Naturally, the firewall 120 may also be incorporated in the router 110 .
  • a terminal such as the personal computer (PC) 400 , PDA or game machine and the like having a built-in modem 460 can be connected directly to the external network 11 , and together with a wireless terminal such as a cell phone 600 being able to connected indirectly through a gateway and base station, a terminal such as the PC 400 , PDA or game machine can be indirectly connected through a modem 730 , a firewall 720 , a router 710 and an LAN (second internal network) 13 .
  • a mail server 800 for enabling data communication of e-mail between external terminals connected to the external network and the NAS 200 is connected to the external network 11 .
  • network addresses such as IP addresses
  • network addresses such as IP addresses
  • IP addresses IP addresses
  • An administrator of the internal network can freely assign local addresses to devices connected to the internal network. The uniqueness of these local addresses is not guaranteed on the external network.
  • a network exchange such as a router 110 for exchanging global addresses assigned on the external network and local addresses assigned on the internal network is provided between both networks.
  • the firewall 120 provided between both networks blocks actions such as readout of data contained in devices on the internal network from the external network or writing of data to devices on the network.
  • the readout of files from a terminal connected to the external network or the storage of files from the terminal cannot be processed with respect to a storage medium of a device only assigned a local address as shown in FIG. 26 .
  • an FTP server 9900 is connected to the external network 11 in order to falsely access a storage medium 9242 of the NAS 9200 .
  • the data structure of the storage medium of this FTP server 9900 is the same as the data structure of the storage medium 9242 of the NAS.
  • an external terminal such as the PC 400 and the FTP server 9900 are connected to the same external network 11 , and are able to carry out data communication of files by mutually designating global addresses.
  • an external terminal such as the PC 400 and the FTP server 9900
  • access to the external terminal may be denied depending on the restrictions of the router 710 and the firewall 720 .
  • an access unit U 1 is provided in the storage device 200 for accepting access to a storage medium 242 for storing files from an external terminal connected to the external network 11 by carrying out data communication of an e-mail E 1 with the external terminal by attaching a target file for accessing the storage medium 242 to the e-mail E 1 .
  • a CPU 211 In the NAS 200 , a CPU 211 , semiconductor memory 212 and 213 , a timer circuit 214 , a LAN communication circuit 230 , a storage unit 240 , an output device 250 and the like are connected to a prescribed system bus 260 to enable mutual input and output of information.
  • the devices 200 , 400 , 500 and the like connected to the LAN 12 are capable of mutual data communication through the LAN communication circuit within each device.
  • a display 251 such as a liquid crystal display or an audio output device 252 that outputs a beeping tone and the like are used for the output device 250 .
  • a CPU 211 controls overall operation of the NAS by carrying out processing for suitably executing a storage device control program or a program for controlling readout of various information from the storage unit 240 to the RAM 213 in accordance with a program written in the ROM 212 .
  • the LAN communication circuit 230 is connected to the LAN 12 and is able to carry out two-way communication through the LAN 12 according to TCP/IP, for example.
  • the storage unit 240 has the information storage medium 242 such as a hard disk and a drive such as a hard disk drive for reading and writing information to and from the information storage medium, and various control programs and information are stored in this storage medium 242 .
  • a magnetic storage medium such as a hard disk, CD-ROM, non-volatile semiconductor memory or power backed-up volatile semiconductor memory and the like can be used for the storage medium 242 .
  • E-mail addresses imparted to the NAS 200 origin data D 1 for sending e-mails, data D 2 representing passwords, data D 3 representing reception conditions and the like are stored in the storage medium 242 .
  • a hierarchical data structure ST 1 containing folders FO 1 to FO 4 is formed in the storage medium 242 according to a prescribed file system, and files F 11 are saved and stored in the hierarchical folders FO 1 to FO 4 .
  • a program for forming the file structure ST 1 in the storage medium 242 and realizing the file system for storing files F 11 is recorded in the ROM 212 and the storage medium 242 .
  • This file system has functions for managing data recorded in the recording medium, including creation, movement or deletion of files and folders in the storage medium and readout of files from the storage medium, in accordance with prescribed data recording format. Normally, the file system is provided as one of the functions possessed by the operating system (OS).
  • OS operating system
  • Files refer to collections of data recorded on the storage medium, and are the units in which data is managed by the OS. Folders are also called directories, and refer to storage locations for categorizing and organizing files. Folders have a hierarchical structure that allows files to be further stored in folders within folders. In the example shown in FIG. 6 , the folder structure ST 1 is shown on the left side, while the contents of a folder FO 3 entitled “neko” are shown on the right side.
  • a CPU 411 controls overall operation of the PC by carrying out processing for suitably executing an OS 441 and an application program (APL) 442 such as mail software as well as a program for controlling readout of various information from the storage unit 440 to the RAM 413 in accordance with a control program written in the ROM 412 .
  • APL application program
  • the LAN communication circuit 450 is connected to the LAN 12 and is able to carry out two-way communication through the LAN 12 according to TCP/IP, for example.
  • the input device 420 has a pointing device 421 such as a mouse and a keyboard 422 as operational input devices, and receives operational inputs from a user.
  • the output device 430 has a display device 431 such as a display or an audio output device 432 such as an audio generator as information output devices, and outputs information to a user by display or audio output.
  • the storage unit 440 has an information storage medium such as a hard disk and a drive such as a hard disk drive for reading and writing information to and from the storage medium, and an OS 231 , an APL 232 and various information are stored in this storage medium.
  • a magnetic storage medium such as a hard disk, CD-ROM, non-volatile semiconductor memory or power backed-up volatile semiconductor memory and the like can be used for the storage medium.
  • a cell phone 600 is provided with a control unit 601 having a CPU 601 b , semiconductor memory 601 c and 601 d , a timer circuit 601 e and the like connected to a system bus 601 a , and a wireless circuit 602 for converting analog signals from an antenna 602 a to digital signals and processing those signals, an audio output device 603 for audio output, an audio input device 604 for audio input, an operating unit 605 for accepting operational inputs from a user by, for example, a plurality of keys, a display unit 606 such as a liquid crystal panel for displaying call status or e-mail and the like on a screen, and a CCD camera 607 for capturing still images and the like are connected to the control unit 601 to enable mutual input and output of information.
  • a control unit 601 having a CPU 601 b , semiconductor memory 601 c and 601 d , a timer circuit 601 e and the like connected to a system bus 601 a , and
  • a base station for the cell phone 600 is connected to a gateway and carries out short-distance wireless communication with the cell phone 600 .
  • the gateway converts the protocol of data from the base station and transmits it to the mail server 800 , for example, or converts the protocol of data from the mail server 800 and transmits it to the base station.
  • a storage unit 840 having a CPU 811 , semiconductor memory 812 and 813 , a timer circuit 814 and an information storage medium 842 and the like is connected to a prescribed system bus 860 to enable mutual input and output of information.
  • a communication circuit 830 is connected to the external network 11 and is able to carry out two-way communication through the external network 11 by TCP/IP, for example.
  • a magnetic storage medium such as a hard disk, CD-ROM, non-volatile semiconductor memory or power backed-up volatile semiconductor memory and the like can be used for the storage medium 842 .
  • FIG. 7 shows an example of setting processing carried out by the PC 400 connected to the LAN 12 .
  • This processing is initiated by a user carrying out an operation that starts up a setting processing program.
  • this processing is not essential in terms of carrying out the present invention, as a result of carrying out this processing, reception conditions and the like when e-mail is received by the NAS 200 are set more easily than by inputting to a PC. Furthermore, this processing is carried out in a device within the PDA 500 and the like connected to the LAN 12 .
  • a main menu for selecting a menu item for setting operating conditions of the NAS is first displayed on a display (Step S 102 , the word “step” will hereinafter be omitted).
  • a plurality of menu items are listed on the main menu, and an area for accepting operations for making menu selections and various buttons and the like are provided thereon.
  • an operational input is accepted from the PC user (S 104 ).
  • an e-mail reception condition setting menu is displayed for setting reception conditions when receiving e-mail by the NAS.
  • a first input column for accepting operational input of a time interval in the form of a first time t 1 (minutes) for confirming the arrival of an e-mail by the NAS when not receiving an e-mail for the purpose of requesting access to the storage medium 242 a second input column for accepting operational input of a time interval in the form of a second time t 2 (minutes) for confirming the arrival of an e-mail when an e-mail has been received for the purpose of requesting access to the storage medium 242
  • a third input column for accepting operational input of a time in the form a time t 3 (minutes) during which t 2 for confirming the arrival of an e-mail after having received the final e-mail for the purpose of requesting access to the storage medium 242 continues, for example, are provided on this menu. Furthermore, the relationship of these times is such that 0 ⁇ t 2 ⁇
  • FIG. 8 shows an example of mail reception processing carried out by the PC 400 connected to the external network 11 .
  • This processing is carried out repeatedly at prescribed time intervals, and involves imparting a mail address to the PC in advance and storing in the storage unit. Furthermore, this processing may also be carried out by an external terminal such as a portable terminal and the like connected to the external network 11 .
  • an inquiry is first made to the mail server 800 as to whether or not e-mail addressed to the PC itself has arrived (S 202 ).
  • the mail server carries out processing that returns information to the PC indicating whether or not unsent e-mail having the e-mail address imparted to the PC is stored in the storage medium 842 in response to a request from the PC.
  • the PC then receives that information returned from the mail server.
  • the PC judges whether or not e-mail addressed to itself has arrived based on that returned information.
  • commands requesting access to the storage medium 242 of the NAS 200 are accepted from an external terminal as a result of data communication of e-mails being carried out between the external terminal such as the PC 400 and the NAS 200 as shown in FIGS. 15 to 25 .
  • commands requesting access to the storage medium 242 from a terminal include a READ (readout) command for reading out files from the storage medium, a WRITE (save) command for writing files to the storage medium, a DELETE command for deleting files and folders from the storage medium, and a DIR (directory) command for reading out the structure of folders from the storage medium.
  • the types of commands for requesting access to the storage medium may be only a portion of these commands or commands other than these commands may also be included therein.
  • a user of an external terminal may happen to forget the above-mentioned commands.
  • a user may not necessarily have the operating manual of this storage system when outside the workplace in particular. Therefore, in the present embodiment, by sending an e-mail for the purpose of requesting initiation of access to the storage medium 242 as shown in FIG. 15 , requesting access to the storage medium 242 can be made by using a list of commands displayed in a reply mail as shown in FIG. 16 .
  • an e-mail can be created for the purpose of requesting access initiation.
  • a send button 481 e is operated with a pointing device and the like, an e-mail for the purpose of requesting access initiation can be sent to the NAS 200 .
  • the mail server 800 receives an e-mail from the PC and stores it in the storage medium 842 , and then sends the e-mail to the NAS in response to a request from the NAS.
  • FIG. 9 shows mail reception processing carried out by the NAS 200 .
  • This processing is carried out repeatedly at a time interval equal to or less than the above-mentioned second time t 2 .
  • the times t 1 , t 2 and t 3 are stored in the storage medium 242 of the NAS
  • the reception interval t (minutes) at which e-mail are acquired in S 304 is stored in RAM 213
  • t 1 is stored for the initial value of t.
  • the NAS acquires the elapsed time te (seconds) from the time of the previous inquiry of the arrival of e-mail at the mail server (S 302 ).
  • the elapsed time te can be determined from the current time Tnow kept by the timer circuit 214 and time of the previous inquiry of the arrival of e-mail at the mail server.
  • the reception interval t is acquired and a judgment is made as to whether or not the elapsed time te is equal to or greater than the reception interval t (S 304 ). If this condition is not met (te ⁇ t), mail reception processing is terminated due to the reception timing.
  • the mail server 800 inquires as to whether or not e-mail addressed to itself has arrived, and in the case e-mail addressed to itself has arrived, processing for acquiring the e-mail from the mail server is carried out (S 306 ).
  • the mail server then carries out processing for returning to the NAS information indicating whether or not an unsent e-mail address of the e-mail address imparted to the NAS is stored in the storage medium 842 in response to a request from the NAS. Therefore, the NAS receives the return information from the mail server and judges whether or not e-mail addressed to itself has arrived based on the return information.
  • an e-mail for the purpose of requesting access to the storage medium 242 is required to have a password for permitting access to the storage medium contained in the title column. Therefore, the NAS judges whether or not an e-mail of the proper format has arrived in which the password contained at the prescribed data position of the e-mail is the password corresponding to data D 2 stored in the storage medium 242 (S 308 ). If an e-mail itself has not arrived, an arrived e-mail is not of the proper format, or the password contained at the prescribed data position of an arrived e-mail does not match the password for permitting access, this condition is treated as not having been met, and processing proceeds to S 310 .
  • a message to that effect may be returned to the external terminal in the form of an error
  • a message to that effect may be returned to the external terminal in the form of an error
  • a judgment is made as to whether or not the above-mentioned third time t 3 has elapsed from the time T 1 at which a valid e-mail containing a password for permitting access was last received. For example, a judgment is made as to whether or not the time resulting from subtracting the time T 1 from the current time Tnow kept by the timer circuit is greater than or equal to the time t 3 .
  • FIG. 16 shows an example of a display screen 482 of the e-mail displayed on the external terminal.
  • Information indicating the NAS 200 (such as the name and e-mail address of the NAS) is displayed in a sender display column 482 a
  • a message indicating that the e-mail is a reply mail is displayed in a title column 482 b
  • a list of commands is displayed in the contents column 482 c on the display screen 482 .
  • information displayed in the contents column 482 c also contains, for example, a list of accessible folders 482 c 3 , and in the case of changing the password for permitting access each time an e-mail is sent, a password 482 c 2 to be included in the next e-mail to be sent is also contained.
  • a reply e-mail display screen containing the information of the contents column 482 c is displayed by processing of the mail software. Furthermore, as shown in FIGS. 17 , 19 , 21 , 23 and 25 , the e-mail address of the NAS 200 or a name corresponding to that e-mail address is automatically inserted into address columns 483 a , 485 a , 487 a , 489 a and 491 a , and information of the contents column ( 482 c ) of the received e-mail is automatically inserted into contents columns 483 c , 485 c , 487 c , 489 c and 491 c .
  • the user name in the case a user name for accessing the storage medium of the NAS is imparted to an external terminal, the user name may be allowed to be entered after “username:”, and in the case a folder password for accessing a folder to be accessed is set for that folder, a folder password may be allowed to be entered after “folderpassword:”.
  • the NAS when the NAS receives an e-mail for the purpose of requesting initiation of access to the storage medium 242 from an external terminal, the NAS sends an e-mail containing a list of commands for accessing the storage medium 242 to the external terminal, and the external terminal sends an e-mail containing a command contained the list.
  • processing for the command contained in the e-mail is carried out on the storage medium 242 .
  • a user using the external terminal is able to execute access to the NAS by designating a command from the external terminal without having to remember commands for accessing the NAS.
  • the storage system containing this storage device 200 is convenient.
  • the path (character string indicating the location of a file or folder in a memory area) of the folder for which folder structure is desired to be read is entered below “folder file:” while leaving only the DIR command as in an e-mail display screen 483 shown in FIG. 17 .
  • an e-mail containing a directory command for reading out the folder structure of the storage medium of the NAS can be easily created, thereby making it possible to easily search for a file or folder to be accessed.
  • the path of the file desired to be saved is entered below “folder file:” while leaving only the WRITE command as in an e-mail display screen 487 shown in FIG. 21 , the file desired to be saved is than attached to an e-mail by selecting that file and operating an attach button 487 f .
  • an e-mail for the purpose of saving an attached file in a specified area of the storage medium of the NAS can be easily created, thereby making it possible to easily read a file desired to be written to the NAS from the storage medium of the NAS.
  • a user can also read, save or delete a file by carrying out an operation for designating a file from an external terminal without reading the folder structure from the storage medium of the NAS with the DIR command.
  • all files and folders stored in the storage medium of the NAS can be deleted.
  • a DELETEALL command is operated by adding “ALL” after the DELETE command as in an e-mail display screen 491 shown in FIG. 25 .
  • an e-mail for the purpose of requesting deletion of all files and folders from the storage medium of the NAS can be easily created, thereby making it possible to format the storage medium of the NAS.
  • a password 482 c 2 , 484 c 2 , 486 c 2 , 488 c 2 or 490 c 2 to be contained in an the next e-mail to be sent is included as in the reply mail shown in FIGS. 16 , 18 , 20 , 22 and 24 .
  • an e-mail for the purpose of requesting access to the storage medium of the NAS can be easily created by a user of an external terminal by operating the reply button 482 e , 484 e , 486 e , 488 e or 490 e followed by entering the password 482 c 2 , 484 c 2 , 486 c 2 , 488 c 2 or 490 c 2 in the title column 483 b , 485 b , 487 b , 489 b or 49 lb of the displayed reply e-mail display screen 483 , 485 , 487 , 489 or 491 together with the name of the NAS 200 (NAS-name).
  • the access unit of the NAS judges whether or not an e-mail containing the password 482 c 2 , 484 c 2 , 486 c 2 , 488 c 2 , 490 c 2 described in S 308 and the above-mentioned commands has arrived from an external terminal, and only carries out processing of the commands contained in the received e-mail in S 314 to S 322 on the storage medium 242 when that e-mail has been received.
  • the NAS 200 sets the time interval t to the second time t 2 (S 318 ) and terminates mail reception processing.
  • processing for receiving e-mail addressed to the NAS is carried out during each time t 2 that is shorter than the first time t 1 when an e-mail has been received for the purpose of requesting initiation of access from an external terminal.
  • the storage device can be accessed from an external terminal without placing a large burden on the mail server.
  • the condition is treated as having been met and processing for each command as shown in FIGS. 10 to 14 is carried out in S 322 , the time interval t is set to the second time t 2 in S 324 and mail reception processing ends.
  • the NAS ends mail reception processing in the case it judges that an e-mail that has arrived is an e-mail not containing the above-mentioned commands in S 320 . Subsequently, mail reception processing is again carried out, e-mails are received when the elapsed time te from the time of the previous inquiry of the arrival of e-mail at the mail server is equal to or greater than the first time t 1 or the second time t 2 , and access processing corresponding to the above-mentioned commands is carried out.
  • the access unit of the NAS carries out processing for receiving e-mails addressed to the NAS during each time t 1 , and when an e-mail for the purpose of requesting initiation of access has been received from an external terminal, processing for receiving e-mails addressed to the NAS is carried out during each time t 2 that is shorter than the time t 1 , and processing of a command contained in the e-mail from the external terminal is carried out on the storage medium.
  • FIG. 10 shows an example of folder structure readout processing carried out in the above-mentioned S 322 in the case the NAS 200 has received an e-mail containing a DIR command and a password for permitting access. This processing is carried out when an e-mail as shown in FIG. 17 , for example, has been received from an external terminal.
  • the NAS extracts information 483 c 1 representing the folder designated in the e-mail from the e-mail and reads out the file structure of the designated folder represented by this information 483 c 1 from the storage medium 242 (S 402 ). Furthermore, in the case the designated folder is not formed in the storage medium, a message to that effect may be returned to the external terminal in the form of an error.
  • origin data D 1 of the e-mail containing a list of commands is read from the storage medium (S 404 ). As shown in the reply mail of FIG.
  • this origin data is in the form of information representing the NAS 200 that is inserted into the sender display column 484 a (such as the NAS name and e-mail address), information inserted into the title column 484 b for the purpose of indicating this to be a reply mail, and information representing a predetermined portion 484 c 1 of the contents column 484 c .
  • information 484 c 3 representing the folder structure read in S 402 is added to the contents column 484 c (S 406 ).
  • a password 484 c 2 differing from the previous password is assigned and this password is added to the contents column 484 c (S 408 ).
  • folder structure readout processing is completed by sending this e-mail to an external terminal (S 410 ).
  • the reply e-mail display screen 484 shown in FIG. 18 is displayed on an external terminal such as the PC 400 . Therefore, a user of an external terminal can easily create an e-mail for the purpose of requesting access to the NAS while referring to the information 484 c 3 representing folder structure by operating the reply button 484 e . For example, as shown in FIG.
  • FIG. 11 shows an example of file readout processing carried out in the step S 322 described above in the case the NAS 200 has received an e-mail containing a READ command and password for permitting access for the purpose of reading a designated file from a storage medium.
  • This processing is carried out when, for example, an e-mail as shown in FIG. 19 has been received from an external terminal.
  • the NAS extracts information 485 c 1 representing a file designated in the e-mail from the e-mail and reads out the designated file represented by this information 485 c 1 from the storage medium 242 (S 422 ). Furthermore, in the case the designated file is not stored in the storage medium, a message to that effect may be returned to the external terminal in the form of an error.
  • origin data D 1 of the e-mail containing a list of commands is read from the storage medium (S 424 ). As shown in the reply mail of FIG.
  • this origin data is in the form of information representing the NAS 200 that is inserted into the sender display column 486 a (such as the NAS name and e-mail address), information inserted into the title column 486 b for the purpose of indicating this to be a reply mail, and information representing a predetermined portion 486 c 1 of the contents column 486 c .
  • information 486 c 3 representing the path and file name of the file read in S 422 is added to the contents column 486 c (S 426 ).
  • the file read in S 422 is attached to the e-mail in the form of an attachment (S 428 ).
  • a password 486 c 2 differing from the previous password is added to the contents column 486 c (S 430 ).
  • file readout processing is completed by sending this e-mail to an external terminal (S 432 ).
  • the reply e-mail display screen 486 shown in FIG. 20 is displayed on an external terminal such as the PC 400 . Therefore, a user of an external terminal can use a file read from the storage medium of the NAS by opening an attached file displayed in the attachment column 486 d or by saving in a prescribed location of the terminal.
  • a user can easily create an e-mail for the purpose of requesting access to the NAS by operating the reply button 486 e .
  • the reply button 486 e when a user enters an NAS name and password in the title column ( 487 b ), attaches a file in the attachment column ( 487 d ), deletes those commands other than a required command from the list of commands in the contents column ( 487 c ), enters required information after deleting unnecessary information below “folder file:” and then operates the send button ( 487 e ), an e-mail can be sent for the purpose of requesting access to the NAS.
  • FIG. 12 shows an example of file storage processing carried out in the S 322 described above in the case the NAS 200 has received an e-mail containing a WRITE command and password for permitting access for the purpose of saving an attached file in a designated folder of a storage medium.
  • This processing is carried out when, for example, an e-mail as shown in FIG. 21 has been received from an external terminal.
  • the NAS extracts information 487 c 1 representing a file designated in the e-mail from the e-mail and saves the attached file in a designated folder (area) represented by this information 487 c 1 (S 442 ). Furthermore, in the case the designated folder is not formed in the storage medium, a message to that effect may be returned to the external terminal in the form of an error, or the designated folder may be formed in the storage medium and the attached file may be saved in that folder.
  • origin data D 1 of the e-mail containing a list of commands is read from the storage medium (S 444 ). As shown in the reply mail of FIG.
  • this origin data is in the form of information representing the NAS 200 that is inserted into the sender display column 488 a (such as the NAS name and e-mail address), information inserted into the title column 488 b for the purpose of indicating this to be a reply mail, and information representing a predetermined portion 488 c 1 of the contents column 488 c .
  • information 488 c 3 representing the path and file name of the file saved in S 442 is added to the contents column 488 c (S 446 ).
  • a password 488 c 2 differing from the previous password is added to the contents column 488 c (S 448 ).
  • a user can easily create an e-mail for the purpose of requesting access to the NAS by operating the reply button 488 e .
  • the reply button 488 e For example, as shown in FIG. 23 , when a user enters an NAS name and password in the title column ( 489 b ), deletes those commands other than a required command from the list of commands in the contents column ( 489 c ), enters required information after deleting unnecessary information below “folder file:” and then operates the send button ( 489 e ), an e-mail can be sent for the purpose of requesting access to the NAS.
  • FIG. 13 shows an example of deletion processing carried out in the S 322 described above in the case the NAS 200 has received an e-mail containing a DELETE command and password for permitting access for the purpose of deleting a designated file or folder in the storage medium.
  • This processing is carried out when, for example, an e-mail as shown in FIG. 23 has been received from an external terminal.
  • the NAS extracts information 489 c 1 representing a file or folder designated in the e-mail from the e-mail and deletes the designated file or folder represented by this information 489 c 1 (S 462 ). Furthermore, in the case the designated file or folder is not contained in the storage medium, a message to that effect may be returned to the external terminal in the form of an error.
  • origin data D 1 of the e-mail containing a list of commands is read from the storage medium (S 464 ). As shown in the reply mail of FIG.
  • this origin data is in the form of information representing the NAS 200 that is inserted into the sender display column 490 a (such as the NAS name and e-mail address), information inserted into the title column 490 b for the purpose of indicating this to be a reply mail, and information representing a predetermined portion 490 c 1 of the contents column 490 c .
  • information 490 c 3 representing the path and file name of the file or folder deleted in S 462 is added to the contents column 490 c (S 466 ).
  • a password 490 c 2 differing from the previous password is added to the contents column 490 c (S 468 ).
  • a user can easily create an e-mail for the purpose of requesting access to the NAS by operating the reply button 490 e .
  • the reply button 490 e For example, as shown in FIG. 25 , when a user enters an NAS name and password in the title column ( 491 b ), deletes those commands other than a required command from the list of commands in the contents column ( 491 c ), deletes information below “folder file:” and then operates the send button ( 491 e ), an e-mail can be sent for the purpose of requesting access to the NAS.
  • FIG. 14 shows an example of all deletion processing carried out in the S 322 described above in the case the NAS 200 has received an e-mail containing a DELETEALL command and password for permitting access.
  • This processing is carried out when, for example, an e-mail as shown in FIG. 25 has been received from an external terminal.
  • This processing is carried out for the purpose of deleting all data on the storage medium of the NAS, and the NAS carries out processing for deleting all data from the storage medium in the case the NAS has sent a confirmation mail to an external terminal, and has received a reply mail for the purpose of deleting all data of the storage medium in response to this confirmation mail.
  • the NAS judges whether or not an e-mail for the purpose of confirming deletion of all data on the storage medium in the form of a confirmation mail has already been sent to an external terminal (S 482 ).
  • a confirmation mail is generated addressed to the external terminal that received the e-mail containing the DELETEALL command (S 484 ).
  • a password differing from the previous password is added to the contents column (S 486 ). Delete all processing is then completed by sending the generated confirmation mail to the external terminal (S 488 ).
  • a user of the external terminal can create a reply mail in response to the confirmation mail in the form of an e-mail containing the DELETEALL command and a password for permitting access, and send that e-mail addressed to the NAS.
  • the NAS receives the reply mail containing the DELETEALL command
  • the NAS again carries out delete all processing in S 322 described above.
  • the condition of S 482 is satisfied, the storage medium is formatted and all data on the storage medium is deleted (S 490 ).
  • delete all processing ends after sending a message to the external terminal to the effect that formatting of the storage medium is in progress (S 492 ).
  • the target file to be accessed is attached to an e-mail, data communication of the e-mail is carried out between the external terminal and the NAS, and access to the storage medium from the external terminal is accepted.
  • the e-mail to which is attached the target file to be accessed is delivered to an external terminal and the NAS by data communication via the external network and the internal network without having to specially set a network exchange or firewall provided between the external network and the internal network.
  • an e-mail attached with data of photographic images captured with the cell phone can be sent to a storage device in the home or office, an e-mail attached with a music file can be received from a storage device in the home when suddenly desiring to listen to music with a cell phone provided with a music playback function, or an e-mail attached with a file containing work-related data can be received from a storage device in the office in the case of suddenly needing work-related data when out of the office.
  • this storage system can be configured using a cell phone as well, making it possible to provide a highly convenient storage system.
  • the above-mentioned internal network may also be configured at least from an external-side internal network connected to an external network, and an internal-side internal network connected to the external-side internal network without being connected to the external network.
  • the above-mentioned external network may also be configured at least from an internal-side external network connected to an internal network, and an external-side external network connected to the internal-side external network without being connected to the internal network.
  • the internal network and the external network may also have a structure consisting of three layers or more. In these cases as well, by attaching a target file for accessing between a storage device connected to the internal network and a terminal connected to the external network, the storage device is able to accept access to a storage medium from the terminal.
  • the e-mail may be sent to a receiving side after encoding on the sending side, after which the e-mail may be decoded on the receiving side.
  • data may be compressed or data may be made to change after encoding in response to a password for accepting access.
  • data communication may also be carried out by dividing data contained in the attached file into a prescribed data size. Whereupon, even in cases in which a mail server does not permit data communication of data of attached files beyond a prescribed data size, data communication of e-mails attached with files having a large data size can be carried out between both sides.
  • part of the order of each step can be interchanged.
  • S 402 and S 404 can be interchanged and S 406 and S 408 can be interchanged. This applies similarly to the processing of FIGS. 11 to 14 .
  • the present invention is not limited to the embodiments and examples described above, but rather configurations resulting from mutually substituting, recombining or changing the configurations disclosed in the embodiments and examples, and configurations resulting from mutually substituting, recombining or changing the known art along with each of the configurations disclosed in the embodiments and examples described above, are also included therein.
  • Another aspect of the present invention provides a storage system having a storage device connected through an internal network with an external network and a terminal coupled with the external network,
  • Another aspect of the present invention provides a computer-readable recording medium on which is recorded a control program of a storage device connected through an internal network with an external network, comprising:
  • a terminal coupled with an external network accesses a storage medium of a storage device coupled with an internal network
  • a target file for accessing the storage medium is attached to an e-mail
  • data communication is carried out of the e-mail between the terminal and the storage device, and access to the storage device from the terminal is accepted.
  • the e-mail attached to the target file for accessing the storage medium is delivered to the terminal and the storage device by data communication via an external network and an internal network without specially setting a network exchange or firewall provided between the external network and the internal network.
  • the storage medium of the storage device can be easily accessed from the external terminal.
  • a storage medium of a storage device can be accessed from an external terminal without having to specially set a network exchange or firewall.
  • An optional aspect of the present invention provides the storage device wherein upon receiving from the terminal an e-mail for the purpose of requesting save of an attached file in a designated area of the storage medium, the access unit saves the attached file in the designated area of the storage medium.
  • a file can be stored in a storage device from external terminals without having to specially set a network exchange.
  • a file stored in a storage device can be read out from an external terminal without having to set special settings in a network exchange.
  • Another optional aspect of the present invention provides the storage device wherein upon receiving from the terminal an e-mail for the purpose of requesting initiation of access to the storage medium, the access unit sends an e-mail containing a list of commands for accessing the storage medium to the terminal, and upon receiving an e-mail containing a command contained in the list of commands from the terminal, the access unit carries out processing of the command contained in the e-mail on the storage medium.
  • a user using an external terminal can execute access to a storage device by specifying a command from the terminal without having to remember a command for accessing the storage device.
  • convenience when executing access to the storage device can be improved.
  • Another optional aspect of the present invention provides the storage device wherein the access unit sends an e-mail to the terminal containing therein a password differing from the password of the previous transmission each time an e-mail is sent, and only when an e-mail containing the password contained in the sent e-mail and the command is received from the terminal, the access unit carries out processing of the command contained in the received e-mail on the storage medium.
  • Another optional aspect of the present invention provides the storage device wherein the access unit carries out processing for receiving an e-mail addressed to the storage device for each first time period, and upon receiving an e-mail for the purpose of requesting initiation of access from the terminal, the access unit carries out processing of the command contained in the e-mail from the terminal on the storage medium by carrying out processing for receiving an e-mail addressed to the storage medium for each second time period that is shorter than the first time period.
  • the storage device since processing for reception of e-mails addressed to a storage device is carried out after waiting for a comparatively long period of time when not accessing the storage device from an external terminal, the storage device can be accessed from an external terminal without placing a large burden on a mail server.

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  • Databases & Information Systems (AREA)
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  • General Engineering & Computer Science (AREA)
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